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FILE - In this Tuesday, April 3, 2007 file photo, technicians work at the reactor building of the Bushehr Nuclear Power Plant, some 750 miles (1,245 kilometers) south of the capital Tehran, Iran. The last time Iran's nuclear envoys held talks with the U.S. and other world powers, the negotiations limped along until a parting shot by the Islamic Republic: Its labs boosted the enrichment levels of uranium in reply to demands for a full-scale freeze.(AP Photo/ISNA, Sot Akbar, File)
/ AP